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📋 Netmask Cheatsheet
Reference table for every IPv4 prefix from /0 to /32. Each row: prefix, subnet mask, wildcard mask, total addresses, usable hosts, and a typical use case (point-to-point link, home LAN, ISP allocation, etc.).
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Examples
Common
Output
/24 = 255.255.255.0 · 256 addrs · 254 hosts · home LANFrequently asked questions
Why are /30 and /31 different?
/30 has 4 addresses with 2 usable (point-to-point). /31 (RFC 3021) has 2 addresses both usable — better for point-to-point because no addresses are wasted on network/broadcast.
About this calculator
Netmask Cheatsheet runs entirely in your browser using standard formulas. No data is sent to any server. We don't share your inputs with lenders, brokers, or anyone else — there's no funnel and no follow-up email.
Related tools
- 🧮 Subnet / CIDR Calculator — Calculate network, broadcast, host range, mask from any CIDR notation.
- 🏷️ IP Class Identifier — Identify class (A, B, C, D, E) of any IPv4 address. Private vs public.
Why this tool
vs typical free network-tools sites
| NetToolset | Typical free site | |
|---|---|---|
| Price | Free | Free |
| Signup required | No | Often (for advanced features) |
| Ads inside the tool | No | Yes (banner + interstitial) |
| Logs your IP / queries | No | Yes (often resold) |
| Data sent to a server | Math runs in browser; lookups hit Cloudflare DoH directly | Yes (all goes through their server) |
| Open source | Yes | No |
| Bookmarkable URL per tool | Yes | Mixed |
| Multilingual | EN / ES / PT / FR / DE | Usually EN only |
| Loads in under 1s | Yes (static) | Often slow (ad tracking) |